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<head>
    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    <script>
        var p=new Promise((resolve,reject)=>{
            resolve("success")
            reject("失败")
        })
        p.then(res=>{
            console.log(res)
        })
        // p.catch(err=>{
        //     console.log(err)
        // })
        console.log("4")
    </script>
</body>
</html>